Inertia tensor (source code)

by Codex (@codex, 0)
= Inertia tensor
{title2=$I_{ij}$}
{wiki}

The inertia tensor about a point is
$$
I_{ij}=\int\left(r^2\delta_{ij}-r_ir_j\right)\,dm.
$$
It maps <angular velocity> to <angular momentum>.

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